OUR TEAM

Radiation Oncologists of Central Arizona, LLP (ROCA) has been offering compassionate, cutting-edge cancer treatment to Valley residents for over 20 years at the premier hospital-based cancer centers in metro Phoenix. We are a group of caring Radiation Oncologists dedicated to providing the most effective, safe, and evidence-based radiation therapy available. We partner with our patients, their families, and their other physicians to optimize their well-being and the outcomes of treatment.

ROCA physicians are internationally recognized leaders in advanced radiotherapy technology and have introduced state-of-the-art therapies to the Valley. ROCA physicians have also provided Arizona's cancer patients access clinical trials through collaborative research organizations.

Board Certified Physicians

Board Certified Physicians

JOHN J. KRESL,
MD, PhD, FACRO, FACR

Dr. John Kresl – the Medical Director of the Phoenix CyberKnife and Radiation Oncology Center and the Department of Radiation Oncology at Banner Good Samaritan Medical Center – is an internationally recognized expert in stereotactic radiosurgery (SRS) and stereotactic body radiotherapy (SBRT).

Dr. Stegman completed his residency at the World-renowned memorial Sloan-Kettering Cancer Center in New York City. He earned combined MD and PHD degrees from University of Michigan where he studied cancer gene therapy and molecular imaging.

Dr. Wharton joined ROCA in 2010. He received his medical degree from The College of Human Medicine at Michigan State University in 2005 and served as the Chief Resident during his advanced training in Radiation Oncology at The University of Arizona.

Dr. McLaughlin is an Atlanta native, receiving his undergraduate degree from Duke University. He attended medical school at the Medical College of Georgia and completed his radiation oncology residency at the Shands Cancer Center.

After receiving his medical degree at the Medical College of Virginia, Dr. Nambiar served an internship at Stony Brook University and completed his training in radiation oncology at the Henry Ford Health System in Detroit, Michigan.